Portland Threshold Days by Year (USC00176902)
17 fixed thresholds counted per year at Portland (USC00176902): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Portland Thresholds
- Portland: days with a maximum temperature at or above 30 C (86 F) in 65 years, most in 1876 with 25.
- Portland: days with a maximum temperature at or below 0 C (32 F) in 65 years, most in 1904 with 89.
- Portland: nights with a minimum temperature at or below 0 C (32 F) in 65 years, most in 1904 with 162.
- Portland: nights with a minimum temperature at or below -10 C (14 F) in 65 years, most in 1904 with 70.
- 17 fixed thresholds have at least one qualifying day at Portland.
Days at or above 30 C (86 F)
65 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1875 | 9 | 12.8 |
| 1876 | 25 | 12.8 |
| 1877 | 5 | 12.8 |
| 1878 | 13 | 12.8 |
| 1879 | 12 | 12.8 |
| 1880 | 9 | 6.4 |
| 1881 | 6 | 6.4 |
| 1882 | 13 | 6.4 |
| 1883 | 5 | 6.4 |
| 1884 | 7 | 6.4 |
| 1885 | 5 | 6.4 |
| 1886 | 4 | 6.4 |
| 1887 | 10 | 6.4 |
| 1888 | 4 | 6.4 |
| 1889 | 1 | 6.4 |
| 1890 | 7 | 7.6 |
| 1891 | 8 | 7.6 |
| 1892 | 9 | 7.6 |
| 1893 | 6 | 7.6 |
| 1894 | 11 | 7.6 |
| 1895 | 6 | 7.6 |
| 1896 | 11 | 7.6 |
| 1897 | 4 | 7.6 |
| 1898 | 7 | 7.6 |
| 1899 | 7 | 7.6 |
| 1900 | 13 | 9.1 |
| 1901 | 14 | 9.1 |
| 1902 | 7 | 9.1 |
| 1903 | 4 | 9.1 |
| 1904 | 4 | 9.1 |
| 1905 | 10 | 9.1 |
| 1906 | 7 | 9.1 |
| 1907 | 6 | 9.1 |
| 1908 | 13 | 9.1 |
| 1909 | 13 | 9.1 |
| 1910 | 8 | 8.1 |
| 1911 | 14 | 8.1 |
| 1912 | 9 | 8.1 |
| 1913 | 10 | 8.1 |
| 1914 | 12 | 8.1 |
| 1915 | 5 | 8.1 |
| 1916 | 4 | 8.1 |
| 1917 | 3 | 8.1 |
| 1918 | 6 | 8.1 |
| 1919 | 10 | 8.1 |
| 1920 | 6 | 8 |
| 1921 | 13 | 8 |
| 1922 | 7 | 8 |
| 1923 | 9 | 8 |
| 1924 | 6 | 8 |
| 1925 | 6 | 8 |
| 1926 | 5 | 8 |
| 1927 | 6 | 8 |
| 1928 | 11 | 8 |
| 1929 | 11 | 8 |
| 1930 | 11 | 10.5 |
| 1931 | 12 | 10.5 |
| 1932 | 7 | 10.5 |
| 1933 | 10 | 10.5 |
| 1934 | 5 | 10.5 |
| 1935 | 11 | 10.5 |
| 1936 | 9 | 10.5 |
| 1937 | 20 | 10.5 |
| 1938 | 14 | 10.5 |
| 1939 | 6 | 10.5 |
| Year | First date | Last date |
|---|---|---|
| 1875 | 1875-06-24 | 1875-08-30 |
| 1876 | 1876-05-27 | 1876-08-11 |
| 1877 | 1877-06-01 | 1877-08-24 |
| 1878 | 1878-06-28 | 1878-07-27 |
| 1879 | 1879-05-31 | 1879-08-06 |
| 1880 | 1880-05-27 | 1880-09-06 |
| 1881 | 1881-05-27 | 1881-09-07 |
| 1882 | 1882-06-24 | 1882-08-17 |
| 1883 | 1883-06-24 | 1883-08-21 |
| 1884 | 1884-06-21 | 1884-09-10 |
| 1885 | 1885-06-16 | 1885-07-26 |
| 1886 | 1886-07-06 | 1886-08-27 |
| 1887 | 1887-05-10 | 1887-08-12 |
| 1888 | 1888-06-18 | 1888-07-24 |
| 1889 | 1889-05-10 | 1889-05-10 |
| 1890 | 1890-06-18 | 1890-08-04 |
| 1891 | 1891-06-14 | 1891-09-25 |
| 1892 | 1892-06-02 | 1892-07-27 |
| 1893 | 1893-06-20 | 1893-08-25 |
| 1894 | 1894-06-17 | 1894-09-05 |
| 1895 | 1895-05-08 | 1895-09-23 |
| 1896 | 1896-05-10 | 1896-08-12 |
| 1897 | 1897-07-09 | 1897-09-10 |
| 1898 | 1898-06-25 | 1898-09-03 |
| 1899 | 1899-06-05 | 1899-08-19 |
| 1900 | 1900-05-15 | 1900-09-12 |
| 1901 | 1901-06-14 | 1901-09-07 |
| 1902 | 1902-05-23 | 1902-07-28 |
| 1903 | 1903-05-18 | 1903-09-14 |
| 1904 | 1904-06-25 | 1904-08-01 |
| 1905 | 1905-06-18 | 1905-08-22 |
| 1906 | 1906-06-09 | 1906-08-23 |
| 1907 | 1907-06-18 | 1907-08-12 |
| 1908 | 1908-05-27 | 1908-09-11 |
| 1909 | 1909-06-21 | 1909-08-25 |
| 1910 | 1910-06-21 | 1910-07-25 |
| 1911 | 1911-05-22 | 1911-08-23 |
| 1912 | 1912-05-24 | 1912-08-25 |
| 1913 | 1913-06-16 | 1913-08-18 |
| 1914 | 1914-05-26 | 1914-09-23 |
| 1915 | 1915-06-29 | 1915-09-17 |
| 1916 | 1916-07-12 | 1916-08-08 |
| 1917 | 1917-06-27 | 1917-07-31 |
| 1918 | 1918-06-02 | 1918-08-24 |
| 1919 | 1919-05-29 | 1919-09-08 |
| 1920 | 1920-06-01 | 1920-09-26 |
| 1921 | 1921-05-21 | 1921-09-03 |
| 1922 | 1922-05-29 | 1922-08-16 |
| 1923 | 1923-06-05 | 1923-08-04 |
| 1924 | 1924-06-24 | 1924-08-30 |
| 1925 | 1925-06-04 | 1925-08-26 |
| 1926 | 1926-06-30 | 1926-08-29 |
| 1927 | 1927-04-20 | 1927-07-29 |
| 1928 | 1928-07-04 | 1928-08-29 |
| 1929 | 1929-05-28 | 1929-09-03 |
| 1930 | 1930-05-06 | 1930-09-03 |
| 1931 | 1931-05-29 | 1931-09-14 |
| 1932 | 1932-05-16 | 1932-09-02 |
| 1933 | 1933-06-08 | 1933-08-02 |
| 1934 | 1934-05-31 | 1934-07-19 |
| 1935 | 1935-06-30 | 1935-08-18 |
| 1936 | 1936-05-18 | 1936-09-08 |
| 1937 | 1937-05-31 | 1937-09-26 |
| 1938 | 1938-04-28 | 1938-08-23 |
| 1939 | 1939-05-28 | 1939-09-16 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 65 | 25 | 1876 | 6 |
| 35 C (95 F): Days | 25 | 6 | 1937 | 1 |
| 90 F (32.2 C): Days | 61 | 11 | 1876 | 1 |
| 100 F (37.8 C): Days | 3 | 1 | 1911 | 1 |
| 0 C (32 F): Ice days (max | 65 | 89 | 1904 | 53 |
| 0 C (32 F): Frost days (min | 65 | 162 | 1904 | 150 |
| -10 C (14 F): Days with min | 65 | 70 | 1904 | 42 |
| -20 C (-4 F): Days with min | 52 | 10 | 1914 | 6 |
| 20 C (68 F): Tropical nights (min | 58 | 13 | 1876 | 2 |
| 25 C (77 F): Days with min | 1 | 1 | 1911 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 64 | 52 | 1888 | 36 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 64 | 19 | 1898 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 57 | 6 | 1922 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 6 | 1 | 1896 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 47 | 13 | 1898 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 29 | 4 | 1933 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 3 | 1 | 1934 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1875.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).